#human-evolution

#human-evolution

In the absence of any fossil of this last common ancestor, it's difficult for scientists to know what this creature may have looked like or how it behaved. While the search for such a fossil continues, some researchers have turned to other, less direct means of studying our ancient lineage, including fossils of extinct human cousins in the family tree, as well as the biology of modern humans and apes.

"How we became human is a story that played out over a very deep time scale and over a very big area," says Eleanor Scerri, emphasizing the long-term influences on human evolution.

The transition from hand-held to hafted tool technology marked a significant shift in conceptualising the construction and function of tools.

The study focused on characteristics of West Eurasians over several thousand years, seeking to understand how Darwinian forces couple to allelic effects and shape the genetic architecture of complex traits.

Chimpanzees consume 10 pounds of fruit pulp per day on average - African star apple. It's delicious, too. I tried some. And when fruits like this ripen, they can ferment, producing alcohol. In primates, it could be that when you smell alcohol, that means that's where the sugars are.

Human breasts sit at an elevated temperature, protecting a newborn from hypothermia. What's more, the size and shape of the breast allows for broad contact surface - enhancing the heat transfer from mother to child. This could improve a newborn's chances of survival and provide an evolutionarily grounded explanation for the development of external breasts in humans.

Somewhere between six and seven million years ago, our ancestors began walking upright, and the advantages were considerable: Freed from locomotion, upper limbs could grasp, manipulate, eventually craft, and the opposable thumb became the hinge on which human civilization would turn. We are, above all else, tool users-fire, the wheel, writing, the printing press, the transistor-each tool reshaping not only what we could do but who we became.

No matter what their gods were, what they did for a living, what they wore, the songs they sang, everything varies except love, and everybody loves. So I became convinced that this was a real thing, that we were built somehow to form partnerships. And then the day came when I thought to myself, "Well, then it must be something in the brain."

Geneticist Svante Paabo demonstrated that DNA can be extracted from human fossils that are thousands of years old. His team was the first to sequence the complete genome of Neanderthals, our closest human relatives, and discovered that Homo Sapiens had sex and children with them. He also revealed the existence of a third, previously unknown human lineage, the Denisovans, thanks to genetic material extracted from a tiny bone of a girl who lived in a Siberian cave some 50,000 years ago.

But now US researchers say that natural selection could have given rise to autism-associated genes, with behaviours associated with the disorder generally involving cognitive traits that are unique to humans. Writing in the journal Molecular Biology and Evolution, experts at Stanford University discovered that the most abundant type of outer-layer brain neurons-called L2/3 IT neurons-evolved exceptionally quickly in humans compared to other mammals.

If you have spent time with an infant, you might recognize the scene: A child is wailing, inconsolable, and you, the parent, have to go to the bathroom. Or eat. Or attend to a pot that's boiling over. But someone needs to watch the baby. Such urgent situations often call for innovation. In modern times, we might negotiate schedules with our partners, seek out affordable child care, or purchase "baby-tainment" contraptions via our phones.

Language likely evolved as a crucial tool to facilitate the care of vulnerable infants, requiring cooperative parenting and communication among groups in early human societies.

When Alien: Earth hits FX on August 12, prepare to ask yourself all kinds of wonderful questions, such as: Are our human bodies not a kind of outdated machine? Are the aliens not just a biological inevitability that we don't yet understand?

The modern form of the gene ADSL in humans reduces enzyme stability compared to that found in Neanderthals or Denisovans, suggesting significant biochemical differences between species.

Trust connects everything-our friendships, families, communities, and even how we run businesses or build nations. It's easy to think of trust as something we're taught by society, but it runs deeper than that.

The discovery represents a major reversal of the prevailing theory of human evolution, which suggested that modern humans descended from a single ancestral lineage in Africa.

Jaws taps a primal fear: predation. We like to think of ourselves as separate and above the rest of the animal kingdom, but movies like Jaws remind us of something else: Sometimes, human beings can be lunch.

"This indicates greater diversity in skin pigmentation than we previously thought," said Maïté Rivollat, chief geneticist of the project, highlighting unexpected findings on skin color variations.

"Evolutionary psychologists have a leading theory that humans began finding revenge pleasurable as part of the ice age, as a way to cause compliance with social norms."